核壳结构CdS@C纳米复合材料的光催化性能研究  

Photocatalytic Properties of Core-Shell Structure CdS@C Nanocomposites

作　　者：张克诚 马强 王健 马龙 卢强 韦琪龙 魏智强[2,3] 乔宏霞 ZHANG Kecheng;MA Qiang;WANG Jian;MA Long;LU Qiang;WEI Qilong;WEI Zhiqiang;QIAO Hongxia(Gansu Fifth Construction Group Company,Tianshui 741000,China;School of Science,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]甘肃第五建设集团有限责任公司,天水741000 [2]兰州理工大学理学院,兰州730050 [3]兰州理工大学土木工程学院,兰州730050

出　　处：《人工晶体学报》2020年第12期2336-2343,共8页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51261015);甘肃省自然科学基金(1308RJZA238);甘肃省青年科技基金(2017GS10910)。

摘　　要：采用水热碳化法成功制备了不同碳含量的CdS@C纳米颗粒,同时对CdS@C的晶体结构、形貌、光学性能、光电化学和光催化性能进行了研究。实验结果表明本方法制备的碳包覆CdS纳米颗粒外壳为碳层,内核为六方纤锌矿结构CdS颗粒。CdS@C颗粒分散性良好,颗粒形貌主要为类球形,粒度均匀。X射线光电子能谱(XPS)证实CdS@C颗粒表面负载的碳主要以非晶碳形式存在。紫外-可见光光谱(UV-Vis)表明CdS@C纳米晶中表面碳的敏化作用提高了可见光响应范围,使得能隙变窄。光致发光光谱(PL)表明碳包覆CdS@C纳米颗粒的发光强度比纯CdS弱,有效抑制了光生载流子的复合。瞬态光电流响应和电化学阻抗谱(EIS)说明CdS@C纳米复合材料更有效促进电子-空穴对分离和提高转移效率。CdS@C纳米复合材料在可见光辐射下表现出良好的光催化活性和稳定性,其中·O2^-和h^+在光催化中起主要作用。CdS@C nanoparticles with different carbon content were successfully prepared by hydrothermal carbonization method,and the phase structure,morphology,optical,photoelectric chemistry and photocatalytic properties of CdS@C were studied.The experimental results show that the shell is successfully prepared as carbon layer,and the hexahedrite structure CdS is used as CdS@C particles in the core.The morphology of CdS@C particles is mainly spherical,with uniform particle size and good dispersion.XPS spectra confirm that the carbon loading on the surface of CdS@C particles mainly existe in the form of amorphous carbon.UV-Vis spectra show that the sensitization of surface carbon in CdS@C nanocrystals increase the visible light response range and narrowed the energy gap.PL show that the luminescence intensity of carbon-coated CdS@C nanoparticles is weaker than that of pure CdS,which effectively inhibited the electron-hole pair recombination.Transient photocurrent response and electrochemical impedance spectroscopy(EIS)indicate that CdS@C nanocomposite have a good optical response and show more efficient photocarrier separation and transfer efficiency.CdS@C nanocomposite exhibites good photocatalytic activity and stability under visible light radiation,and·O2^-and h^+play major roles in photocatalysis.

关 键 词：碳包覆 CDS 核壳结构 光电化学性能 光催化 CdS@C纳米复合材料 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]